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From "Chris Trezzo (JIRA)" <j...@apache.org>
Subject [jira] [Work started] (HDFS-9922) Upgrade Domain placement policy status marks a good block in violation when there are decommissioned nodes
Date Tue, 08 Mar 2016 19:14:40 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Work on HDFS-9922 started by Chris Trezzo.
------------------------------------------
> Upgrade Domain placement policy status marks a good block in violation when there are
decommissioned nodes
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9922
>                 URL: https://issues.apache.org/jira/browse/HDFS-9922
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Chris Trezzo
>            Assignee: Chris Trezzo
>            Priority: Minor
>
> When there are replicas of a block on a decommissioned node, BlockPlacementStatusWithUpgradeDomain#isUpgradeDomainPolicySatisfied
returns false when it should return true. This is because numberOfReplicas is the number of
in-service replicas for the block and upgradeDomains.size() is the number of upgrade domains
across all replicas of the block. Specifically, we hit this scenario when numberOfReplicas
is equal to upgradeDomainFactor and upgradeDomains.size() is greater than numberOfReplicas.
> {code}
> private boolean isUpgradeDomainPolicySatisfied() {
>     if (numberOfReplicas <= upgradeDomainFactor) {
>       return (numberOfReplicas == upgradeDomains.size());
>     } else {
>       return upgradeDomains.size() >= upgradeDomainFactor;
>     }
>   }
> {code}



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